title: Reinforcement of a PMMA resin for fixed interim prostheses with nanodiamonds.
abstract: The aim of this study was to investigate the possible reinforcement of Nanodiamonds (ND) in a PMMA resin for fixed interim restorations. The fracture toughness (K(Ic)), impact strength and the dynamic thermomechanical properties (T(g), E´, E´´, tanδ) of a series of PMMA-ND nanocomposites with different amounts of ND were evaluated. The fracture toughness increased as the ND percentage increased up to 0.38% wt but a greater amount of ND induced a decrease in K(Ic). Impact strength and Young's modulus were also increased by increasing nanoparticles content, indicating the reinforcing effect of ND. Dynamic mechanical properties were also affected. By increasing the ND content an increase of storage modulus was recorded, while glass transition was shifted at higher temperatures. Under the limitations of this study, it can be suggested that reinforcing PMMA with ND nanoparticles -especially at low concentrations- may increase the overall performance of fixed interim prostheses.
authors.affiliation: Department of Fixed Prostheses and Implants Prosthodontics, School of Dentistry, Aristotle University of Thessaloniki, GR-541 24, Thessaloniki, Macedonia, Greece.
authors.forename: Popi
authors.initials: P
authors.lastname: Protopapa
authors.forename: Eleana
authors.initials: E
authors.lastname: Kontonasaki
authors.forename: Dimitrios
authors.initials: D
authors.lastname: Bikiaris
authors.forename: Konstantinos M
authors.initials: KM
authors.lastname: Paraskevopoulos
authors.forename: Petros
authors.initials: P
authors.lastname: Koidis
mesh_terms: D003764:Dental Materials / Q000737:chemistry*; D003830:Denture, Partial, Fixed; D003833:Denture, Partial, Temporary; D055119:Elastic Modulus; D005898:Glass / Q000737:chemistry; D006244:Hardness; D006801:Humans; D008422:Materials Testing; D055595:Mechanical Phenomena; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D058612:Nanodiamonds / Q000737:chemistry*; D044367:Phase Transition; D018583:Pliability; D019904:Polymethyl Methacrylate / Q000737:chemistry*; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D013816:Thermodynamics; D013997:Time Factors; D044366:Transition Temperature; D014867:Water / Q000737:chemistry
chemical_list: D003764:Dental Materials; D058612:Nanodiamonds; D014867:Water; D019904:Polymethyl Methacrylate